She has maintained a fairly flawless figure well in to her 40s; she does a diet called "The Zone" and works out.
http://www.modelsblog.info/2009/08/17/how-you-can-get-a-body-like-cindy-crawford/
http://www.modelsblog.info/2009/08/17/how-you-can-get-a-body-like-cindy-crawford/